In 1999, as a sophomore, he made his first appearance for the South Korea national baseball team, and competed in international matches for three-consecutive years until graduation.
In October 2002, he was selected for the South Korea national baseball team that finished runner-up at the 2002 Intercontinental Cup in Havana, Cuba.
In the 2008 season, Chae played in 112 games as a starting catcher, setting career-highs in hits (73) and RBI (42), but struggled at the plate, batting .215 with 5 home runs.
Due to the poor offensive performance in the previous year and a persistent shoulder injury, Chae started the 2009 season in the second (reserve) team of the Bears.
Chae finished the 2009 season with a disappointing batting average of .178 and 2 home runs, appearing in only 49 games as a platoon or backup catcher.